jclasslib bytecode viewer is a tool that visualizes all aspects of compiled Java class files and the contained bytecode. In addition, it contains a library that enables developers to read, modify, and write Java class files and bytecode.

Flat Assembler is a fast and efficient self-assembling 80x86 assembler. It supports x86 and x86-64 instruction sets with MMX, 3DNow!, SSE up to SSE4, AVX, AVX2, and XOP extensions. It can produce output in binary, MZ, PE, COFF, or ELF format. It includes powerful but easy-to-use macroinstruction support and does multiple passes to optimize the instruction codes for size. It is written entirely in assembly language.

An almost ISO C compatible C compiler that produces binaries for 6502-based computers. Targets that are supported out of the box are: Apple ][, Atari 8-bit machines, Commodore C64/C128/C16/C116, Commodore Plus/4, Commodore 600/700, GEOS for C64, and Lynx. The package includes a complete suite of assembler development tools (assembler, linker, archiver) which allows mixing of C and assembler code.

Komodo IDE is a multi-platform, multi-language IDE for end-to-end development of dynamic Web applications. It makes creating robust apps fast and easy, with a rich feature set for client-side AJAX technologies such as CSS, HTML, JavaScript, and XML, coupled with advanced support for dynamic languages such as Perl, PHP, Python, Ruby and Tcl. Features include comprehensive editing and debugging plus intelligent tools for regular expressions, team development, customization, and extensibility. The result is a powerful coding environment for framework stacks like Ruby on Rails and CakePHP and client libraries such as the Yahoo! UI Library and Dojo.

Nonpareil is a microcode-level simulator for HP calculators introduced between 1972 and 1982, including the HP-35, HP-45, HP-55, HP-25, HP-34C, HP-38C, HP-41CV, HP-11C, HP-12C, HP-15C, HP-16C, and other models. The necessary microcode is included, as is a microcode assembler. The GTK+ toolkit is used for the user interface.

The Amsterdam Compiler Kit is a fully-featured
retargetable compiler toolchain. It will
cross-compile ANSI C, K&R C, Pascal, Modula-2,
Occam, Fortran and Basic for a number of
architectures including, but not limited to, the
6500, 68000, Z80, i80, i86, i386, and PDP-11. It
provides a complete development environment
including preprocessors, compilers, assemblers,
linkers, librarian tools, and target download
tools.